Generation of continuous-wave broadband entangled beams using periodically poled lithium niobate waveguides

Ken Ichiro Yoshino, Takao Aoki, Akira Furusawa

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Continuous-wave light beams with broadband quantum entanglement are created with two independent squeezed light beams generated by two periodically poled lithium niobate waveguides and a symmentric beam splitter. The quantum entanglement is confirmed with a sufficient criterion Δ A,B 2 = 〈 [Δ (x A - x B)] 2 〉 + 〈 [Δ (p A + p B)] 2 〉 <1 and the observed Δ A,B 2 is 0.75 over the bandwidth of 30 MHz. Although the bandwidth is limited by that of the detector so far, it would be broadened up to 10 THz which would be only limited by the bandwidth of phase matching for the second-order nonlinear process.

Original languageEnglish
Article number041111
JournalApplied Physics Letters
Issue number4
Publication statusPublished - 2007
Externally publishedYes


ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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